code: def test_create_gnn():
      conv = GCNConv(16, 32)
      x = torch.randn(5, 16)
      edge_index = torch.randint(5, (2, 64), dtype=torch.long)
      out = conv(x, edge_index)
      assert out.size() == (5, 32)
  
file_path: pytorch_geometric/test/nn/conv/test_create_gnn.py
imports: import torch
  from torch_geometric.nn import MessagePassing
  from torch_geometric.utils import add_self_loops, degree
label_desc: Use image node_id 1 for calling a global function with example usage: test_create_gnn() without return types